<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 100px;
            height: 100px;
            background-color: steelblue;
            /* border: tomato 5px solid; */
            border-top: solid tomato 5px;
            border-left: tomato solid 10px;
            /* 只能设置左右浮动 */
            float:right;

        }
        .box1{
            width: 200px;
            height: 200px;
            color: blue;
        }
    </style>
</head>
<body>
    <div class="box">哈哈</div>
    <!-- div>div*2表示创建一个父div里面创建两个div -->
    <div class="box1">
        <div></div>
        <div></div>
    </div>
</body>
</html>